Intraosseous syringe and needle



citizen of the United States,-residing at Jan. 13, 1925.

STATES PATENT] ,OFFICE. Q

GEO'R GE N. HEIN, OF SAN FRANCISCO, CALIFORNIA.

' INTRAOSSEOUS. SYRINGE :AND NEEDLE.

a licati n filed August as, 1924. Serial No. 734,211.

To all whom it may concern;

Be it known that I, GnoRcnN. HEIN, a

the city and county of San Franciscoand State of California, haveinvented certain new and useful Improvements in Intra:

osseous Syringes and Needles, of which the.

provide'an' instrumentiadapted for the 1n jection and withdrawal of fluids into and from the interior of bony tissues, with greater convenience and saving .of time andv energy than. by present methods. The attainment ofthis object and. the use ture of my invention will, be fully disclosed in and by the following descriptiom takon in connection with the accompanying drawings, it being understood that changes in details ofform and construction may be made without departing from the principle and spirit of the invention as defined by the claims hereunto appended; n

In the drawings i Fig. 1 is a longitudinal sectional view, partly in elevation, of my intraosseous syringe and needle.

Fig. 2 is a sectional view, enlarged, of the chuck and joint connection between the needle and piston. I V

Fig. 3 is an elevation, enlarged, of the needle.

Fig. 4 is a perspective view of the penetrating and boring point of the needle.

1 is the barrel of the syrin to the end of which is fitted the hand c asp spring 2, provided with the sleeve 3 in whlchthe opposin free ends of the clasp telescope to provi e for necessary adjustment. 4 is piston of the syringe fitted within the barrel 1. the association being such as to provide for both linear and rotative relative movement.

The piston 4 has a through channel t, the forward end of which opens into the apex of the conical base 5 of the bore of the internally threaded chuck-seat 5 formed on the iston end. 6 is the needle chuck fitted in t e seat 5. The inner end of chuck is formed with seat'socket 6", the base of which is conical, as shown at 6'. 7 is the needle having the through channel 7. The inner end of the needle is formed or provided with a bearinghub comprising a rela tively large diameter front portion 8 with a conical front end 8 and a reduced portion 9 with a conical rear end 9. When the needle is fitted in the chuck and tightened up to the piston, the conical rear end 9' bears a ainst the conical base 5 of the bore of the c uck-seat 5, while the conical front end 8' bears against the conical base .6 of the socket 6150f the needle chuck 6, and in this fitting the continuitynf the piston channel 4' and the needle channel 7 is preserved, whileat the same time an effective wipejoint isformed, by reason of the difference between the areas of the frictional surfaces 8', 6', and 9, 5, without any packing, and said joint having thefurther function of serving as a clutch to prevent the needle from having any movement on its axis independent of the axial rotation of the piston in the use of the instrument as will presently appear. p t r The needle is formed-with a penetrating point 10 and in addition. thereto said POifit 15 provided with drill cutters 11 of suitable form, preferably auger-like, as shown. in

,Fig. 4, so that said needle has the dual ca,

pacity or. function of penetration by linear pressure and boring by rotative axial movement. Carried by thepiston 4 is the finger grip 12 to enable the operator to rotate it. Upon the needle 7 is a shding sleeve 13, Fig. 3, to prevent outflow of solution while operating. The operation of instrument will be best understood and appreciated by comparison with present practise.

In dentistry there is a method of producing local anaesthesia known as intraosseous. This method, briefly, consists of first injectingta few drops of anaesthetic solution in the so tissue overlying the bony tissue to be entered. A hole is thenfbored through the compact or outer layer of bone or of the alveolar process, until the spongy or inner portion of the bone is entered. Then the rill is removed. and a suitable hy odermic syringe mounted with a blunt need e is used for injecting the anaesthetic solution into the cancellous portion of the bone surrounding the roots of the teeth and their nerve fila- .ments. The nerves thus being bathed in the anaestheticsolution, immediately lose their power of conveying sensory impulses,

'ing it possible for the operator to work on my appliance to penetrate'and inject'thesolut-ion into' the bony tissue instead of two operations as in common practice. The operator, after the ordinary preliminary injection of the anaesthetic solution into the by meanslof the grip 12, rotating the piston" softtissueoverlying the bony tissue," enters the present instrument, and by simultaneously linearly pressing forward the solution-holding barrel 1, and with his fingers,

I 4 end the needle 'itcarries, advances the "injecting the solution.

the wiping joint surfaces de'scribedy-has no;

needle-boringly into the bony tissue while the'needle, as heretofore mentioned, due to tendency'to rotation independently ofthe rdtationof the'piston. 7 t

I claim V '1. A surgical instrument for the described purpose comprising a syringe member; and

a hypodermlcx needle member in communicative connection with said syringe member,

said needle member havmg a point adapted for penetrative boring.

2. A surgical instrument for the described urpose comprising a syringe member; a ypodermic needle'member having a point adapted for penetrative boring; and means In this operation,

for associatin said members in communicative connection adapting them for relative rotation.

3. A surgical instrument 'for the described purpose, comprisin a s ringe barrel; a channeled piston sidab y and rotatively fitted vto said barrel and a hypo 'dermic needle .communicatively associated and rotatable with said having a' point adapte boring. V

'4. A surgical instrument for the described purpose, comprising a syringe barrel, a. channeledpiston 'slidably and rotatively fitted to said barrel; means on said piston for. rotating it; and a hy 'odermic needle communicatively associated 'and rotatable with said piston, said needle'having a'point adapted for penetrative boring.

A surgical instrument for the described (piston, said needle for penetrative purpose comprisin e a syringe barrel' a channeled, piston s lidably and rotatively fitted to'jsaid barrel, said piston having its outerv end formed 'wit'h'a chuck seat having a conical'bas'e into which the channel of the piston opens; a chnck'fitted in the chuck seat and having its inner endformedwith a socket having a conical base; and a hypodermic needle fitted" in saidi'chuck,the inner end of said needle having a bearing wit h'a concal forward end of relatively large area contactin "with the conical base of the chuck-soc et and with a conical rear end of V relatively small area contacting with the conical base, of" the chuck-seat, and said needle having a point adapted for penetrative boring. y In testimony whereof Ihave signed my name to this specification. a

' I GEORGE N. HEIN. 

